Who says that highways can’t be green? Not the environmentally friendly folks in Carmel, Indiana. They’ve built a double teardrop roundabout that may be the greenest highway intersection in the United States.
When the time came for the city to make a major upgrade to Keystone Parkway, one of their busiest intersections, they decided to take an eco-friendly approach to it. Not only has their innovative thinking reduced carbon emissions and made the area much more pedestrian friendly, it’s also reduced the amount of car accidents.
The Keystone Parkway uses 1/3 less area than the tightest traditional diamond intersection. The design preserved dozens of buildings, reduced traffic noise and eliminated stoplights. By getting rid of all the stoplights, they were able to reduce car idling, improve traffic flow and reduce accidents by 78 percent. They didn’t just take elements out – they also added in some new ones, such as green space, street lighting and wide egress.
It cost $112 million to redo the Keystone Parkway, which saved the city $1 million in construction costs compared to traditional designs. Would you like to see similar road construction used in your city? Leave us your thoughts in the comments section below.